From 037c87837fd13b042fb5de065ff0e1420b8a70bc Mon Sep 17 00:00:00 2001
From: Robert Hensing <robert@roberthensing.nl>
Date: Thu, 9 Jun 2022 01:24:38 +0200
Subject: [PATCH] Add default network with `name = project.name`

---
 docs/modules/ROOT/partials/NixOSOptions.adoc  | 31 +++++++++++++++----
 .../testdata/Arion/NixSpec/arion-compose.json |  6 +++-
 src/nix/modules/composition/networks.nix      | 20 +++++++++++-
 3 files changed, 49 insertions(+), 8 deletions(-)

diff --git a/docs/modules/ROOT/partials/NixOSOptions.adoc b/docs/modules/ROOT/partials/NixOSOptions.adoc
index 76ad2a4..131bf4f 100644
--- a/docs/modules/ROOT/partials/NixOSOptions.adoc
+++ b/docs/modules/ROOT/partials/NixOSOptions.adoc
@@ -22,6 +22,30 @@ Attribute set that will be turned into the docker-compose.yaml file, using Nix's
 Type:: attribute set
 No Default:: {blank}
 
+No Example:: {blank}
+
+== enableDefaultNetwork
+
+Whether to define the default network:
+
+```nix
+networks.default = {
+  name = config.project.name;
+};
+```
+
+
+[discrete]
+=== details
+
+Type:: boolean
+Default::
++
+----
+true
+----
+
+
 No Example:: {blank}
 
 == host.nixStorePrefix
@@ -79,12 +103,7 @@ See link:https://docs.docker.com/compose/compose-file/#networks-top-level-elemen
 === details
 
 Type:: lazy attribute set of submodules
-Default::
-+
-----
-{}
-----
-
+No Default:: {blank}
 
 No Example:: {blank}
 
diff --git a/src/haskell/testdata/Arion/NixSpec/arion-compose.json b/src/haskell/testdata/Arion/NixSpec/arion-compose.json
index 54e4c24..5f644ac 100644
--- a/src/haskell/testdata/Arion/NixSpec/arion-compose.json
+++ b/src/haskell/testdata/Arion/NixSpec/arion-compose.json
@@ -1,5 +1,9 @@
 {
-    "networks": {},
+    "networks": {
+        "default": {
+            "name": "unit-test-data"
+        }
+    },
     "services": {
         "webserver": {
             "command": [
diff --git a/src/nix/modules/composition/networks.nix b/src/nix/modules/composition/networks.nix
index 6bbb181..15435d9 100644
--- a/src/nix/modules/composition/networks.nix
+++ b/src/nix/modules/composition/networks.nix
@@ -21,13 +21,31 @@ in
       description = ''
         ${dockerComposeRef "networks-top-level-element"}
       '';
-      default = {};
+    };
+    enableDefaultNetwork = mkOption {
+      type = types.bool;
+      description = ''
+        Whether to define the default network:
+
+        ```nix
+        networks.default = {
+          name = config.project.name;
+        };
+        ```
+      '';
+      default = true;
     };
   };
 
 
   config = {
 
+    networks = optionalAttrs config.enableDefaultNetwork {
+      default = {
+        name = config.project.name;
+      };
+    };
+
     docker-compose.raw.networks =
       lib.mapAttrs (k: v: v.out) config.networks;